diff --git a/extra_foam/special_suite/config.py b/extra_foam/special_suite/config.py
index 9b39054f7..deb4099f9 100644
--- a/extra_foam/special_suite/config.py
+++ b/extra_foam/special_suite/config.py
@@ -67,6 +67,6 @@ def topics(self):
 _MAX_N_GOTTHARD_PULSES = 120
 
 GOTTHARD_DEVICE = {
-    "MID": "MID_EXP_DES/DET/GOTTHARD_RECEIVER:daqOutput",
+    "MID": "MID_EXP_DES/DET/GOTTHARD_RECEIVER:output",
     "SCS": "SCS_PAM_XOX/DET/GOTTHARD_RECEIVER1:daqOutput",
 }
diff --git a/extra_foam/special_suite/gotthard_pump_probe_w.py b/extra_foam/special_suite/gotthard_pump_probe_w.py
index 53ab60b06..808de1129 100644
--- a/extra_foam/special_suite/gotthard_pump_probe_w.py
+++ b/extra_foam/special_suite/gotthard_pump_probe_w.py
@@ -7,6 +7,8 @@
 Copyright (C) European X-Ray Free-Electron Laser Facility GmbH.
 All rights reserved.
 """
+import numpy as np
+
 from PyQt5.QtCore import Qt
 from PyQt5.QtGui import QIntValidator
 from PyQt5.QtWidgets import QSplitter
@@ -94,8 +96,10 @@ def __init__(self, *, parent=None):
 
     def updateF(self, data):
         """Override."""
-        self._mean.setData(data['vfom_mean'])
-        self._mean_ma.setData(data['vfom_ma_mean'])
+        vfom_mean = data['vfom_mean']
+        x = np.arange(len(vfom_mean))
+        self._mean.setData(x, vfom_mean)
+        self._mean_ma.setData(x, data['vfom_ma_mean'])
 
 
 class GotthardPpFomPulsePlot(PlotWidgetF):
@@ -128,8 +132,10 @@ def updateF(self, data):
             self._idx = idx
             self._updateTitle()
 
-        self._poi.setData(data['vfom'][idx])
-        self._poi_ma.setData(data['vfom_ma'][idx])
+        vfom = data['vfom'][idx]
+        x = np.arange(len(vfom))
+        self._poi.setData(x, vfom)
+        self._poi_ma.setData(x, data['vfom_ma'][idx])
 
 
 class GotthardPpRawPulsePlot(PlotWidgetF):
@@ -161,8 +167,10 @@ def updateF(self, data):
             self._idx = idx
             self._updateTitle()
 
-        self._on.setData(data['raw'][data['on_slicer']][idx])
-        self._off.setData(data['raw'][data['off_slicer']][idx])
+        on = data['raw'][data['on_slicer']][idx]
+        x = np.arange(len(on))
+        self._on.setData(x, on)
+        self._off.setData(x, data['raw'][data['off_slicer']][idx])
 
 
 class GotthardPpDarkPulsePlot(PlotWidgetF):
@@ -192,7 +200,9 @@ def updateF(self, data):
             self._idx = idx
             self._updateTitle()
 
-        self._plot.setData(data['raw'][data['dark_slicer']][idx])
+        raw = data['raw'][data['dark_slicer']][idx]
+        x = np.arange(len(raw))
+        self._plot.setData(x, raw)
 
 
 class GotthardPpImageView(ImageViewF):
diff --git a/extra_foam/special_suite/gotthard_w.py b/extra_foam/special_suite/gotthard_w.py
index dd21d5814..3de0fbfa5 100644
--- a/extra_foam/special_suite/gotthard_w.py
+++ b/extra_foam/special_suite/gotthard_w.py
@@ -9,6 +9,8 @@
 """
 from string import Template
 
+import numpy as np
+
 from PyQt5.QtCore import Qt
 from PyQt5.QtGui import QDoubleValidator, QIntValidator
 from PyQt5.QtWidgets import QCheckBox, QSplitter
@@ -112,16 +114,19 @@ def __init__(self, *, parent=None):
 
     def updateF(self, data):
         """Override."""
+        spectrum = data['spectrum_mean']
+        spectrum_ma = data['spectrum_ma_mean']
+
         x = data["x"]
         if x is None:
-            self._mean.setData(data['spectrum_mean'])
-            self._mean_ma.setData(data['spectrum_ma_mean'])
             self.setLabel('bottom', "Pixel")
+            x = np.arange(len(spectrum))
         else:
-            self._mean.setData(x, data['spectrum_mean'])
-            self._mean_ma.setData(x, data['spectrum_ma_mean'])
             self.setLabel('bottom', "eV")
 
+        self._mean.setData(x, spectrum)
+        self._mean_ma.setData(x, spectrum_ma)
+
 
 class GotthardPulsePlot(PlotWidgetF):
     """GotthardPulsePlot class.
@@ -152,16 +157,19 @@ def updateF(self, data):
             self._idx = idx
             self._updateTitle()
 
+        spectrum = data['spectrum'][idx]
+        spectrum_ma = data['spectrum_ma'][idx]
+
         x = data["x"]
         if x is None:
-            self._poi.setData(data['spectrum'][idx])
-            self._poi_ma.setData(data['spectrum_ma'][idx])
             self.setLabel('bottom', "Pixel")
+            x = np.arange(len(spectrum))
         else:
-            self._poi.setData(x, data['spectrum'][idx])
-            self._poi_ma.setData(x, data['spectrum_ma'][idx])
             self.setLabel('bottom', "eV")
 
+        self._poi.setData(x, spectrum)
+        self._poi_ma.setData(x, spectrum_ma)
+
 
 class GotthardImageView(ImageViewF):
     """GotthardImageView class.
diff --git a/extra_foam/special_suite/tests/__init__.py b/extra_foam/special_suite/tests/__init__.py
index a2cfd0aba..2baeaad7b 100644
--- a/extra_foam/special_suite/tests/__init__.py
+++ b/extra_foam/special_suite/tests/__init__.py
@@ -3,6 +3,8 @@
 
 from extra_foam.gui.plot_widgets import TimedPlotWidgetF, TimedImageViewF
 
+from extra_foam.special_suite import logger, mkQApp
+
 
 class _SpecialSuiteWindowTestBase(unittest.TestCase):
     @staticmethod
@@ -12,15 +14,22 @@ def data4visualization():
     def _check_update_plots(self):
         win = self._win
         worker = win._worker_st
-        worker._output_st.put_pop(self.data4visualization())
-
-        win.updateWidgetsST()
-        for widget in win._plot_widgets_st:
-            if isinstance(widget, TimedPlotWidgetF):
-                widget.refresh()
-        for widget in win._image_views_st:
-            if isinstance(widget, TimedImageViewF):
-                widget.refresh()
+
+        with self.assertLogs(logger, level="ERROR") as cm:
+            logger.error("dummy")  # workaround
+
+            win.updateWidgetsST()  # with empty data
+
+            worker._output_st.put_pop(self.data4visualization())
+            win.updateWidgetsST()
+            for widget in win._plot_widgets_st:
+                if isinstance(widget, TimedPlotWidgetF):
+                    widget.refresh()
+            for widget in win._image_views_st:
+                if isinstance(widget, TimedImageViewF):
+                    widget.refresh()
+
+            self.assertEqual(1, len(cm.output))
 
 
 class _SpecialSuiteProcessorTestBase:
diff --git a/extra_foam/special_suite/tests/test_camview.py b/extra_foam/special_suite/tests/test_camview.py
index c2b4094d7..87798639f 100644
--- a/extra_foam/special_suite/tests/test_camview.py
+++ b/extra_foam/special_suite/tests/test_camview.py
@@ -17,12 +17,15 @@
     CamViewWindow, CameraView, CameraViewRoiHist
 )
 
+from . import _SpecialSuiteWindowTestBase, _SpecialSuiteProcessorTestBase
+
+
 app = mkQApp()
 
-logger.setLevel('CRITICAL')
+logger.setLevel('INFO')
 
 
-class TestCamView(unittest.TestCase):
+class TestCamViewWindow(_SpecialSuiteWindowTestBase):
     @classmethod
     def setUpClass(cls):
         cls._win = CamViewWindow('SCS')
@@ -32,6 +35,14 @@ def tearDownClass(cls):
         # explicitly close the MainGUI to avoid error in GuiLogger
         cls._win.close()
 
+    @staticmethod
+    def data4visualization():
+        """Override."""
+        return {
+            "displayed": np.arange(20).reshape(4, 5),
+            "roi_hist": (np.arange(4), np.arange(4), 1, 2, 3)
+        }
+
     def testWindow(self):
         win = self._win
 
@@ -43,7 +54,7 @@ def testWindow(self):
         self.assertEqual(1, counter[CameraView])
         self.assertEqual(1, counter[CameraViewRoiHist])
 
-        win.updateWidgetsST()
+        self._check_update_plots()
 
     def testCtrl(self):
         from extra_foam.special_suite.cam_view_w import (
@@ -99,7 +110,7 @@ def testCtrl(self):
         self.assertEqual(999, proc._n_bins)
 
 
-class TestCamViewProcessor(_RawDataMixin):
+class TestCamViewProcessor(_RawDataMixin, _SpecialSuiteProcessorTestBase):
     @pytest.fixture(autouse=True)
     def setUp(self):
         self._proc = CamViewProcessor(object(), object())
@@ -208,6 +219,7 @@ def testProcessing(self, subtract_dark):
 
         # 1st train
         processed = proc.process(self._get_data(12345))
+        self._check_processed_data_structure(processed)
         np.testing.assert_array_almost_equal(imgdata_gt, processed["displayed"])
 
         # 2nd train
@@ -222,3 +234,8 @@ def testProcessing(self, subtract_dark):
         # reset
         proc.reset()
         assert proc._raw_ma is None
+
+    def _check_processed_data_structure(self, ret):
+        """Override."""
+        data_gt = TestCamViewWindow.data4visualization().keys()
+        assert set(ret.keys()) == set(data_gt)
diff --git a/extra_foam/special_suite/tests/test_gotthard.py b/extra_foam/special_suite/tests/test_gotthard.py
index 02a978d86..5e646d04e 100644
--- a/extra_foam/special_suite/tests/test_gotthard.py
+++ b/extra_foam/special_suite/tests/test_gotthard.py
@@ -21,12 +21,14 @@
     ProcessingError
 )
 
+from . import _SpecialSuiteWindowTestBase, _SpecialSuiteProcessorTestBase
+
 app = mkQApp()
 
-logger.setLevel('CRITICAL')
+logger.setLevel('INFO')
 
 
-class TestGotthard(unittest.TestCase):
+class TestGotthardWindow(_SpecialSuiteWindowTestBase):
     @classmethod
     def setUpClass(cls):
         cls._win = GotthardWindow('MID')
@@ -36,6 +38,19 @@ def tearDownClass(cls):
         # explicitly close the MainGUI to avoid error in GuiLogger
         cls._win.close()
 
+    @staticmethod
+    def data4visualization(n_pulses=4):
+        """Override."""
+        return {
+            "x": None,
+            "spectrum": np.arange(10 * n_pulses).reshape(n_pulses, 10),
+            "spectrum_ma": np.arange(10 * n_pulses).reshape(n_pulses, 10),
+            "spectrum_mean": np.arange(10),
+            "spectrum_ma_mean": np.arange(10),
+            "poi_index": 0,
+            "hist": (np.arange(5), np.arange(5), 1, 1, 1),
+        }
+
     def testWindow(self):
         win = self._win
 
@@ -49,7 +64,7 @@ def testWindow(self):
         self.assertEqual(1, counter[GotthardPulsePlot])
         self.assertEqual(1, counter[GotthardHist])
 
-        win.updateWidgetsST()
+        self._check_update_plots()
 
     def testCtrl(self):
         from extra_foam.special_suite.gotthard_w import _DEFAULT_N_BINS, _DEFAULT_BIN_RANGE
@@ -135,7 +150,7 @@ def testCtrl(self):
         self.assertTrue(proc._hist_over_ma)
 
 
-class TestGotthardProcessor(_RawDataMixin):
+class TestGotthardProcessor(_RawDataMixin, _SpecialSuiteProcessorTestBase):
     @pytest.fixture(autouse=True)
     def setUp(self):
         self._proc = GotthardProcessor(object(), object())
@@ -269,6 +284,7 @@ def testProcessing(self, subtract_dark):
 
         # 1st train
         processed = proc.process(self._get_data(12345))
+        self._check_processed_data_structure(processed)
         assert 1 == processed["poi_index"]
         np.testing.assert_array_almost_equal(adc_gt, processed["spectrum"])
         np.testing.assert_array_almost_equal(adc_gt, processed["spectrum_ma"])
@@ -329,3 +345,8 @@ def testRemoveDark(self):
         proc.onRemoveDark()
         assert proc._dark_ma is None
         assert proc._dark_mean_ma is None
+
+    def _check_processed_data_structure(self, ret):
+        """Override."""
+        data_gt = TestGotthardWindow.data4visualization().keys()
+        assert set(ret.keys()) == set(data_gt)
diff --git a/extra_foam/special_suite/tests/test_gotthard_pump_probe.py b/extra_foam/special_suite/tests/test_gotthard_pump_probe.py
index 8cbde77f0..e9910bbbf 100644
--- a/extra_foam/special_suite/tests/test_gotthard_pump_probe.py
+++ b/extra_foam/special_suite/tests/test_gotthard_pump_probe.py
@@ -18,12 +18,14 @@
 )
 from extra_foam.special_suite.special_analysis_base import ProcessingError
 
+from . import _SpecialSuiteWindowTestBase, _SpecialSuiteProcessorTestBase
+
 app = mkQApp()
 
-logger.setLevel('CRITICAL')
+logger.setLevel('INFO')
 
 
-class TestGotthardPumpProbe(unittest.TestCase):
+class TestGotthardPpWindow(_SpecialSuiteWindowTestBase):
     @classmethod
     def setUpClass(cls):
         cls._win = GotthardPumpProbeWindow('SCS')
@@ -33,6 +35,23 @@ def tearDownClass(cls):
         # explicitly close the MainGUI to avoid error in GuiLogger
         cls._win.close()
 
+    @staticmethod
+    def data4visualization(n_pulses=5, n_on=2, n_off=2):
+        """Override."""
+        return {
+            "raw": np.arange(8*n_pulses).reshape(n_pulses, 8),
+            "corrected": np.arange(8 * n_pulses).reshape(n_pulses, 8),
+            "on_slicer": slice(0, n_on),
+            "off_slicer": slice(n_on, n_on + n_off),
+            "dark_slicer": slice(n_on + n_off, None),
+            "poi_index": n_on - 1,
+            "dark_poi_index": 0,
+            "vfom": np.arange(40).reshape(5, 8),
+            "vfom_ma": np.arange(40).reshape(5, 8),
+            "vfom_mean": np.arange(8),
+            "vfom_ma_mean": np.arange(8),
+        }
+
     def testWindow(self):
         win = self._win
 
@@ -47,7 +66,7 @@ def testWindow(self):
         self.assertEqual(1, counter[GotthardPpRawPulsePlot])
         self.assertEqual(1, counter[GotthardPpDarkPulsePlot])
 
-        win.updateWidgetsST()
+        self._check_update_plots()
 
     def testCtrl(self):
         win = self._win
@@ -103,7 +122,7 @@ def testCtrl(self):
         self.assertEqual(9, proc.__class__._vfom_ma.window)
 
 
-class TestGotthardPpProcessor(_RawDataMixin):
+class TestGotthardPpProcessor(_RawDataMixin, _SpecialSuiteProcessorTestBase):
     @pytest.fixture(autouse=True)
     def setUp(self):
         self._proc = GotthardPpProcessor(object(), object())
@@ -153,9 +172,15 @@ def testProcessing(self):
         adc_gt = self._adc.astype(_PIXEL_DTYPE)
 
         processed = proc.process(self._get_data(12345))
+        self._check_processed_data_structure(processed)
 
         np.testing.assert_array_almost_equal(adc_gt, processed["raw"])
         corrected_gt = adc_gt - np.mean(adc_gt[proc._dark_slicer], axis=0)
         np.testing.assert_array_almost_equal(corrected_gt, processed["corrected"])
         vfom_gt = corrected_gt[proc._on_slicer] - corrected_gt[proc._off_slicer]
         np.testing.assert_array_almost_equal(vfom_gt, processed["vfom"])
+
+    def _check_processed_data_structure(self, ret):
+        """Override."""
+        data_gt = TestGotthardPpWindow.data4visualization().keys()
+        assert set(ret.keys()) == set(data_gt)
diff --git a/extra_foam/special_suite/tests/test_module_scan.py b/extra_foam/special_suite/tests/test_module_scan.py
index fbac2941c..bc6909eaa 100644
--- a/extra_foam/special_suite/tests/test_module_scan.py
+++ b/extra_foam/special_suite/tests/test_module_scan.py
@@ -12,13 +12,14 @@
     ModuleScanWindow
 )
 
+from . import _SpecialSuiteWindowTestBase, _SpecialSuiteProcessorTestBase
 
 app = mkQApp()
 
-logger.setLevel('CRITICAL')
+logger.setLevel('INFO')
 
 
-class TestModuleScan(unittest.TestCase):
+class TestModuleScan(_SpecialSuiteWindowTestBase):
     @classmethod
     def setUpClass(cls):
         cls._win = ModuleScanWindow('DET')
diff --git a/extra_foam/special_suite/tests/test_multicamview.py b/extra_foam/special_suite/tests/test_multicamview.py
index 402125eb0..fecb1b1ce 100644
--- a/extra_foam/special_suite/tests/test_multicamview.py
+++ b/extra_foam/special_suite/tests/test_multicamview.py
@@ -16,12 +16,14 @@
     MultiCamViewWindow, CameraView
 )
 
+from . import _SpecialSuiteWindowTestBase, _SpecialSuiteProcessorTestBase
+
 app = mkQApp()
 
-logger.setLevel('CRITICAL')
+logger.setLevel('INFO')
 
 
-class TestMultiCamView(unittest.TestCase):
+class TestMultiCamViewWindow(_SpecialSuiteWindowTestBase):
     @classmethod
     def setUpClass(cls):
         cls._win = MultiCamViewWindow('SCS')
@@ -31,6 +33,14 @@ def tearDownClass(cls):
         # explicitly close the MainGUI to avoid error in GuiLogger
         cls._win.close()
 
+    @staticmethod
+    def data4visualization():
+        """Override."""
+        return {
+            "channels": {0: "camera1", 1: None, 2: None, 3: "camera2"},
+            "images": {0: np.ones((4, 5)), 1: None, 2: None, 3: np.ones((5, 6))}
+        }
+
     def testWindow(self):
         win = self._win
 
@@ -41,7 +51,7 @@ def testWindow(self):
 
         self.assertEqual(4, counter[CameraView])
 
-        win.updateWidgetsST()
+        self._check_update_plots()
 
     def testCtrl(self):
 
@@ -67,7 +77,7 @@ def testCtrl(self):
             self.assertEqual(f"new/property{i}", proc._properties[i])
 
 
-class TestMultiCamViewProcessor(_RawDataMixin):
+class TestMultiCamViewProcessor(_RawDataMixin, _SpecialSuiteProcessorTestBase):
     @pytest.fixture(autouse=True)
     def setUp(self):
         self._proc = MultiCamViewProcessor(object(), object())
@@ -89,6 +99,8 @@ def testProcessing(self):
         })
 
         processed = proc.process(data)
+        self._check_processed_data_structure(processed)
+
         for i, gt in enumerate(proc._output_channels):
             assert gt == processed["channels"][i]
 
@@ -97,3 +109,8 @@ def testProcessing(self):
         np.testing.assert_array_equal(np.ones((3, 3)), processed["images"][2])
         np.testing.assert_array_equal(np.ones((4, 4)), processed["images"][3])
         assert np.float32 == processed["images"][3].dtype
+
+    def _check_processed_data_structure(self, ret):
+        """Override."""
+        data_gt = TestMultiCamViewWindow.data4visualization().keys()
+        assert set(ret.keys()) == set(data_gt)
diff --git a/extra_foam/special_suite/tests/test_trxas.py b/extra_foam/special_suite/tests/test_trxas.py
index e966e9631..b1e079539 100644
--- a/extra_foam/special_suite/tests/test_trxas.py
+++ b/extra_foam/special_suite/tests/test_trxas.py
@@ -20,7 +20,7 @@
 
 app = mkQApp()
 
-logger.setLevel('CRITICAL')
+logger.setLevel('INFO')
 
 
 class TestTrXasWindow(_SpecialSuiteWindowTestBase):
diff --git a/extra_foam/special_suite/tests/test_xas_tim.py b/extra_foam/special_suite/tests/test_xas_tim.py
index f93adb677..84d89fa8a 100644
--- a/extra_foam/special_suite/tests/test_xas_tim.py
+++ b/extra_foam/special_suite/tests/test_xas_tim.py
@@ -23,7 +23,7 @@
 
 app = mkQApp()
 
-logger.setLevel('CRITICAL')
+logger.setLevel('INFO')
 
 
 class TestXasTimWindow(_SpecialSuiteWindowTestBase):
@@ -42,11 +42,11 @@ def data4visualization(n_trains=10, n_pulses_per_train=10, n_bins=6):
         """Override."""
         return {
             "xgm_intensity": np.arange(n_pulses_per_train),
-            "digitizer_apds": [np.arange(n_pulses_per_train)] * 4,
+            "digitizer_apds": [np.arange(n_pulses_per_train)] * 3 + [None],
             "energy_scan": (np.arange(n_trains), np.arange(n_trains)),
             "correlation_length": 20,
             "i0": np.arange(n_trains * n_pulses_per_train),
-            "i1": [np.arange(n_trains * n_pulses_per_train)] * 4,
+            "i1": [np.arange(n_trains * n_pulses_per_train)] * 3 + [None],
             "spectra": ([np.arange(n_bins)] * 5, np.arange(n_bins), np.arange(n_bins)),
         }
 
diff --git a/extra_foam/special_suite/tests/test_xas_tim_xmcd.py b/extra_foam/special_suite/tests/test_xas_tim_xmcd.py
index fb6e96b69..1271779e9 100644
--- a/extra_foam/special_suite/tests/test_xas_tim_xmcd.py
+++ b/extra_foam/special_suite/tests/test_xas_tim_xmcd.py
@@ -23,7 +23,7 @@
 
 app = mkQApp()
 
-logger.setLevel('CRITICAL')
+logger.setLevel('INFO')
 
 
 class TestXasTimXmcdWindow(_SpecialSuiteWindowTestBase):
@@ -42,12 +42,12 @@ def data4visualization(n_trains=10, n_pulses_per_train=10, n_bins=6):
         stats.append(np.arange(n_bins))
         return {
             "xgm_intensity": np.arange(n_pulses_per_train),
-            "digitizer_apds": [np.arange(n_pulses_per_train)] * 4,
+            "digitizer_apds": [np.arange(n_pulses_per_train)] * 3 + [None],
             "energy_scan": (np.arange(n_trains), np.arange(n_trains)),
             "current_scan": (np.arange(n_trains), np.arange(n_trains)),
             "correlation_length": 20,
             "i0": np.arange(n_trains * n_pulses_per_train),
-            "i1": [np.arange(n_trains * n_pulses_per_train)] * 4,
+            "i1": [np.arange(n_trains * n_pulses_per_train)] * 3 + [None],
             "spectra": (stats, np.arange(n_bins), np.arange(n_bins)),
         }
 
diff --git a/extra_foam/special_suite/xas_tim_w.py b/extra_foam/special_suite/xas_tim_w.py
index c945720ca..ce4c15f64 100644
--- a/extra_foam/special_suite/xas_tim_w.py
+++ b/extra_foam/special_suite/xas_tim_w.py
@@ -9,6 +9,8 @@
 """
 from functools import partial
 
+import numpy as np
+
 from PyQt5.QtCore import Qt
 from PyQt5.QtGui import QDoubleValidator, QIntValidator
 from PyQt5.QtWidgets import (
@@ -145,7 +147,9 @@ def __init__(self, *, parent=None):
 
     def updateF(self, data):
         """Override."""
-        self._plot.setData(data['xgm_intensity'])
+        i = data['xgm_intensity']
+        x = np.arange(len(i))
+        self._plot.setData(x, i)
 
 
 class XasTimDigitizerPulsePlot(PlotWidgetF):
@@ -171,7 +175,11 @@ def __init__(self, *, parent=None):
     def updateF(self, data):
         """Override."""
         for p, apd in zip(self._plots, data['digitizer_apds']):
-            p.setData(apd)
+            if apd is None:
+                p.setData([], [])
+            else:
+                x = np.arange(len(apd))
+                p.setData(x, apd)
 
 
 class XasTimMonoScanPlot(TimedPlotWidgetF):